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This study introduces local reflective metasurfaces for precise control over reflected wave power distribution without needing auxiliary evanescent fields. These power-conformal metamirrors offer versatile applications in acoustics and electromagnetics.

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Area of Science:

  • Metasurfaces and wave manipulation
  • Acoustics and electromagnetics

Background:

  • Metasurface field control often requires nonlocal responses and auxiliary evanescent fields.
  • Achieving arbitrary manipulation of reflected fields presents significant complexity.

Purpose of the Study:

  • To introduce purely local reflective metasurfaces for arbitrary manipulation of reflected wave power distribution.
  • To demonstrate the elimination of auxiliary evanescent field excitation in metasurface applications.

Main Methods:

  • Analysis of power flow distribution.
  • Adaptation of reflector shape to desired incident and reflected field distributions.
  • Implementation using conventional passive unit cells.

Main Results:

  • Development of power-conformal metamirrors based on local responses.
  • Demonstration of arbitrary power distribution control without auxiliary evanescent fields.
  • Successful application to anomalous reflection and beam splitting for acoustic and electromagnetic waves.

Conclusions:

  • Purely local reflective metasurfaces enable versatile wave manipulation.
  • The proposed method simplifies the design of multifunctional reflecting surfaces.
  • Applicable to both acoustic and electromagnetic wave phenomena.